Effects of oil on wildlife and habitat

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U.S. Fish & Wildlife Service
Effects of Oil on Wildlife and Habitat
FWS/Drew Wirwa
FWS/Tom MacKenzie
The U.S. Fish and Wildlife
Service is the federal
agency responsible for
many of the nation’s fish
and wildlife resources
and one of the primary
trustees for fish, wildlife
and habitat at oil spills.
The Service is actively involved
in response efforts related to the
Deepwater Horizon oil spill that
occurred in the Gulf of Mexico on April
20, 2010. Many species of wildlife,
including some that are threatened or
endangered, live along the Gulf Coast
and could be impacted by the spill.
Oil spills affect wildlife and their
habitats in many ways. The severity
of the injury depends on the type and
quantity of oil spilled, the season and
weather, the type of shoreline, and the
type of waves and tidal energy in the
area of the spill.
Oil can be categorized into five groups,
ranging from very light to very heavy
oils. Most oil has a density less than
water, so it floats. Oil tends to spread
into a thin layer on the water surface
as a sheen. Once in the water, oil
undergoes weathering, a process that
describes the physical, chemical, and
biological changes that occur when oil
interacts with the environment.
Weathering reduces the more toxic
elements in oil products over time as
exposure to air, sunlight, wave and
tidal action, and certain microscopic
organisms degrades and/or disperses
oil. Weathering rates depend on
factors such as type of oil, weather,
temperature, and the type of shoreline
and bottom that occur in the spill area.
Types of Oil
Although there are different types of
oil, the oil involved in the Deepwater
Horizon spill is classified as light crude.
Light crude is moderately volatile and
can leave a residue of up to one third of
the amount spilled after several days.
It leaves a film on intertidal resources
and has the potential to cause long-term
contamination.
Impacts to Wildlife and Habitat
Oil causes harm to wildlife through
physical contact, ingestion, inhalation
and absorption. Floating oil can
contaminate plankton, which includes
algae, fish eggs, and the larvae of
various invertebrates. Fish feeding
on these organisms can subsequently
become contaminated through
ingestion of contaminated prey or
by direct toxic effects of oil. Larger
animals in the food chain, including
humans, can consume contaminated
organisms as they feed on these fish.
Although oil causes immediate effects
throughout the entire spill area,
it is the external effects of oil on
larger wildlife species that are often
immediately apparent.
Birds and Mammals
Birds such as brown pelicans are likely
to be exposed to oil as they float on the
water’s surface. Oiled birds can lose the
ability to fly, dive for food or float on the
water which could lead to drowning. Oil
interferes with the water repellency of
feathers and can cause hypothermia in
the right conditions.
As birds groom themselves, they
can ingest and inhale the oil on their
bodies. While ingestion can kill animals
immediately, more often it results in
lung, liver, and kidney damage which
can lead to death.
Sea turtles such as loggerheads and
leatherbacks could be impacted as they
swim to shore for nesting activities.
Bird and turtle nest eggs may be
damaged if an oiled adult lies on the
nest.
Scavengers such as bald eagles, gulls,
raccoons, and skunks are also exposed
to oil by feeding on carcasses of
contaminated fish and wildlife.
Long-term effects on birds and marine
mammals are less understood, but
oil ingestion has been shown to cause
suppression to the immune system,
organ damage, skin irritation and
ulceration, and behavioral changes.
Damage to the immune system can
lead to secondary infections that
cause death and behavioral changes
may affect an animal’s ability to find
food or avoid predators. Long-term
consequences can include impaired
reproduction potentially impacting
population levels.
Shellfish
Oil can be toxic to shellfish including
bottom dwelling (lobsters, crabs, etc.)
and intertidal (clams, oysters, etc.)
species. The bottom dwelling species
may be particularly vulnerable when oil
Protective boom deployed at Breton National
Wildlife Refuge.
Laughing gulls at Breton National Wildlife
Refuge. Booms deployed in background.
U.S. Fish & Wildlife Service
FWS/Tom MacKenzie FWS/Nick Wirwa
becomes highly concentrated along the
shoreline. Some can survive exposure,
but may accumulate high levels of
contaminants in their bodies that can
be passed on to predators.
Fish
Fish can be impacted directly through
uptake by the gills, ingestion of oil or
oiled prey, effects on eggs and larval
survival, or changes in the ecosystem
that support the fish. Adult fish may
experience reduced growth, enlarged
livers, changes in heart and respiration
rates, fin erosion, and reproductive
impairment when exposed to oil. Oil
has the potential to impact spawning
success as eggs and larvae of many
fish species are highly sensitive to oil
toxins.
Plants
Marine algae and seaweed responds
variably to oil, and oil spills may result
in die-offs for some species. Algae
may die or become more abundant in
response to oil spills. Although oil can
prevent the germination and growth of
marine plants, most vegetation appears
to recover after cleanup.
Habitat
Oil has the potential to persist in the
environment long after a spill event and
has been detected in sediment 30 years
after a spill. On sandy beaches, oil can
sink deep into the sediments. In tidal
flats and salt marshes, oil may seep
into the muddy bottoms. Effects of oil
in these systems have the potential
to have long-term impacts on fish and
wildlife populations.
The Service responds to oil spills to
minimize impacts to trust resources.
The Service’s work continues long
after a spill event occurs. Damage
assessments of habitat and wildlife
are conducted to find ways that will
minimize long-term effects on new
generations of wildlife.
Hotlines
For media: Joint Information Center:
985/902 5231 and 985/902 5240
To report claims related to damages:
800/440 0858
To volunteer: 866/448 5816
To report oiled or injured wildlife:
866/557 1401
On the web
The USCG Joint Incident Command:
http://www.deepwaterhorizonresponse.
com/go/site/2931/
Department of the Interior:
http://www.doi.gov
U.S. Fish and Wildlife Service:
http://www.fws.gov/home/dhoilspill
http://www.twitter.
comUSFWSSoutheast/
Tweets related to oil spill under
hashtag #oilspill
http://www.facebook.com/pages/
US-Fish-and-Wildlife-Service/282/483
15774
A brown pelican that had been oiled and then cleaned soars after being released at Pelican
Island National Wildlife Refuge near Vero Beach, Florida on 5/10/10.
May 2010
BP contractors loading protective booms in Venice, Louisiana on 4/30/10 to be
deployed in the Gulf of Mexico.

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U.S. Fish & Wildlife Service
Effects of Oil on Wildlife and Habitat
FWS/Drew Wirwa
FWS/Tom MacKenzie
The U.S. Fish and Wildlife
Service is the federal
agency responsible for
many of the nation’s fish
and wildlife resources
and one of the primary
trustees for fish, wildlife
and habitat at oil spills.
The Service is actively involved
in response efforts related to the
Deepwater Horizon oil spill that
occurred in the Gulf of Mexico on April
20, 2010. Many species of wildlife,
including some that are threatened or
endangered, live along the Gulf Coast
and could be impacted by the spill.
Oil spills affect wildlife and their
habitats in many ways. The severity
of the injury depends on the type and
quantity of oil spilled, the season and
weather, the type of shoreline, and the
type of waves and tidal energy in the
area of the spill.
Oil can be categorized into five groups,
ranging from very light to very heavy
oils. Most oil has a density less than
water, so it floats. Oil tends to spread
into a thin layer on the water surface
as a sheen. Once in the water, oil
undergoes weathering, a process that
describes the physical, chemical, and
biological changes that occur when oil
interacts with the environment.
Weathering reduces the more toxic
elements in oil products over time as
exposure to air, sunlight, wave and
tidal action, and certain microscopic
organisms degrades and/or disperses
oil. Weathering rates depend on
factors such as type of oil, weather,
temperature, and the type of shoreline
and bottom that occur in the spill area.
Types of Oil
Although there are different types of
oil, the oil involved in the Deepwater
Horizon spill is classified as light crude.
Light crude is moderately volatile and
can leave a residue of up to one third of
the amount spilled after several days.
It leaves a film on intertidal resources
and has the potential to cause long-term
contamination.
Impacts to Wildlife and Habitat
Oil causes harm to wildlife through
physical contact, ingestion, inhalation
and absorption. Floating oil can
contaminate plankton, which includes
algae, fish eggs, and the larvae of
various invertebrates. Fish feeding
on these organisms can subsequently
become contaminated through
ingestion of contaminated prey or
by direct toxic effects of oil. Larger
animals in the food chain, including
humans, can consume contaminated
organisms as they feed on these fish.
Although oil causes immediate effects
throughout the entire spill area,
it is the external effects of oil on
larger wildlife species that are often
immediately apparent.
Birds and Mammals
Birds such as brown pelicans are likely
to be exposed to oil as they float on the
water’s surface. Oiled birds can lose the
ability to fly, dive for food or float on the
water which could lead to drowning. Oil
interferes with the water repellency of
feathers and can cause hypothermia in
the right conditions.
As birds groom themselves, they
can ingest and inhale the oil on their
bodies. While ingestion can kill animals
immediately, more often it results in
lung, liver, and kidney damage which
can lead to death.
Sea turtles such as loggerheads and
leatherbacks could be impacted as they
swim to shore for nesting activities.
Bird and turtle nest eggs may be
damaged if an oiled adult lies on the
nest.
Scavengers such as bald eagles, gulls,
raccoons, and skunks are also exposed
to oil by feeding on carcasses of
contaminated fish and wildlife.
Long-term effects on birds and marine
mammals are less understood, but
oil ingestion has been shown to cause
suppression to the immune system,
organ damage, skin irritation and
ulceration, and behavioral changes.
Damage to the immune system can
lead to secondary infections that
cause death and behavioral changes
may affect an animal’s ability to find
food or avoid predators. Long-term
consequences can include impaired
reproduction potentially impacting
population levels.
Shellfish
Oil can be toxic to shellfish including
bottom dwelling (lobsters, crabs, etc.)
and intertidal (clams, oysters, etc.)
species. The bottom dwelling species
may be particularly vulnerable when oil
Protective boom deployed at Breton National
Wildlife Refuge.
Laughing gulls at Breton National Wildlife
Refuge. Booms deployed in background.
U.S. Fish & Wildlife Service
FWS/Tom MacKenzie FWS/Nick Wirwa
becomes highly concentrated along the
shoreline. Some can survive exposure,
but may accumulate high levels of
contaminants in their bodies that can
be passed on to predators.
Fish
Fish can be impacted directly through
uptake by the gills, ingestion of oil or
oiled prey, effects on eggs and larval
survival, or changes in the ecosystem
that support the fish. Adult fish may
experience reduced growth, enlarged
livers, changes in heart and respiration
rates, fin erosion, and reproductive
impairment when exposed to oil. Oil
has the potential to impact spawning
success as eggs and larvae of many
fish species are highly sensitive to oil
toxins.
Plants
Marine algae and seaweed responds
variably to oil, and oil spills may result
in die-offs for some species. Algae
may die or become more abundant in
response to oil spills. Although oil can
prevent the germination and growth of
marine plants, most vegetation appears
to recover after cleanup.
Habitat
Oil has the potential to persist in the
environment long after a spill event and
has been detected in sediment 30 years
after a spill. On sandy beaches, oil can
sink deep into the sediments. In tidal
flats and salt marshes, oil may seep
into the muddy bottoms. Effects of oil
in these systems have the potential
to have long-term impacts on fish and
wildlife populations.
The Service responds to oil spills to
minimize impacts to trust resources.
The Service’s work continues long
after a spill event occurs. Damage
assessments of habitat and wildlife
are conducted to find ways that will
minimize long-term effects on new
generations of wildlife.
Hotlines
For media: Joint Information Center:
985/902 5231 and 985/902 5240
To report claims related to damages:
800/440 0858
To volunteer: 866/448 5816
To report oiled or injured wildlife:
866/557 1401
On the web
The USCG Joint Incident Command:
http://www.deepwaterhorizonresponse.
com/go/site/2931/
Department of the Interior:
http://www.doi.gov
U.S. Fish and Wildlife Service:
http://www.fws.gov/home/dhoilspill
http://www.twitter.
comUSFWSSoutheast/
Tweets related to oil spill under
hashtag #oilspill
http://www.facebook.com/pages/
US-Fish-and-Wildlife-Service/282/483
15774
A brown pelican that had been oiled and then cleaned soars after being released at Pelican
Island National Wildlife Refuge near Vero Beach, Florida on 5/10/10.
May 2010
BP contractors loading protective booms in Venice, Louisiana on 4/30/10 to be
deployed in the Gulf of Mexico.